./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 753b20bc59ec3e8b11fc0f1b54dadf2ece41f6cecc7eda05bde7d4413de53136 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:15:27,985 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:15:28,054 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-24 23:15:28,060 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:15:28,061 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:15:28,087 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:15:28,088 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:15:28,089 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:15:28,090 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:15:28,091 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:15:28,091 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:15:28,092 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:15:28,093 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:15:28,093 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:15:28,094 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:15:28,094 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:15:28,095 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:15:28,096 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:15:28,096 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:15:28,097 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:15:28,098 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:15:28,099 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:15:28,099 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-24 23:15:28,100 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-24 23:15:28,101 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:15:28,101 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:15:28,102 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:15:28,102 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:15:28,103 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:15:28,103 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-24 23:15:28,104 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-24 23:15:28,104 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-24 23:15:28,105 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:15:28,105 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-24 23:15:28,105 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 23:15:28,106 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:15:28,106 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:15:28,106 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:15:28,106 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:15:28,107 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:15:28,107 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:15:28,108 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:15:28,108 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:15:28,108 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:15:28,108 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:15:28,109 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:15:28,109 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:15:28,109 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:15:28,110 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 753b20bc59ec3e8b11fc0f1b54dadf2ece41f6cecc7eda05bde7d4413de53136 [2023-11-24 23:15:28,372 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:15:28,404 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:15:28,408 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:15:28,409 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:15:28,410 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:15:28,411 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i [2023-11-24 23:15:31,666 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:15:31,929 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:15:31,930 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i [2023-11-24 23:15:31,948 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/data/4f3483ec7/dee0688fbd7a459f9dce6b6ffb29396f/FLAGdcd2007bf [2023-11-24 23:15:31,964 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/data/4f3483ec7/dee0688fbd7a459f9dce6b6ffb29396f [2023-11-24 23:15:31,967 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:15:31,969 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:15:31,970 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:15:31,971 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:15:31,991 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:15:31,992 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:15:31" (1/1) ... [2023-11-24 23:15:31,993 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32aa1be7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:31, skipping insertion in model container [2023-11-24 23:15:31,994 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:15:31" (1/1) ... [2023-11-24 23:15:32,059 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:15:32,550 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:15:32,566 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:15:32,667 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:15:32,709 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:15:32,710 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32 WrapperNode [2023-11-24 23:15:32,710 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:15:32,711 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:15:32,712 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:15:32,712 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:15:32,720 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,756 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,798 INFO L138 Inliner]: procedures = 125, calls = 94, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 315 [2023-11-24 23:15:32,799 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:15:32,799 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:15:32,800 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:15:32,800 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:15:32,819 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,820 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,838 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,852 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,882 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,890 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,909 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,911 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,915 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:15:32,916 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:15:32,916 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:15:32,917 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:15:32,917 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (1/1) ... [2023-11-24 23:15:32,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:15:32,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:15:32,958 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:15:32,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:15:33,008 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:15:33,008 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:15:33,008 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-24 23:15:33,009 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:15:33,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-24 23:15:33,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-24 23:15:33,011 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:15:33,011 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:15:33,012 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:15:33,012 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:15:33,013 INFO L130 BoogieDeclarations]: Found specification of procedure append [2023-11-24 23:15:33,013 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2023-11-24 23:15:33,185 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:15:33,188 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:15:34,177 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:15:34,271 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:15:34,271 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-24 23:15:34,273 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:15:34 BoogieIcfgContainer [2023-11-24 23:15:34,274 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:15:34,278 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:15:34,278 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:15:34,280 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:15:34,281 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:15:31" (1/3) ... [2023-11-24 23:15:34,282 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@368d21df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:15:34, skipping insertion in model container [2023-11-24 23:15:34,282 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:15:32" (2/3) ... [2023-11-24 23:15:34,282 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@368d21df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:15:34, skipping insertion in model container [2023-11-24 23:15:34,282 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:15:34" (3/3) ... [2023-11-24 23:15:34,284 INFO L112 eAbstractionObserver]: Analyzing ICFG split_list_test05-1.i [2023-11-24 23:15:34,306 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:15:34,307 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 147 error locations. [2023-11-24 23:15:34,385 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:15:34,393 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@89c0436, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:15:34,393 INFO L358 AbstractCegarLoop]: Starting to check reachability of 147 error locations. [2023-11-24 23:15:34,400 INFO L276 IsEmpty]: Start isEmpty. Operand has 293 states, 130 states have (on average 2.353846153846154) internal successors, (306), 279 states have internal predecessors, (306), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:34,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-24 23:15:34,406 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:34,407 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-24 23:15:34,408 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:34,417 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:34,417 INFO L85 PathProgramCache]: Analyzing trace with hash 18449, now seen corresponding path program 1 times [2023-11-24 23:15:34,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:34,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913418073] [2023-11-24 23:15:34,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:34,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:34,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:34,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:34,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:34,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913418073] [2023-11-24 23:15:34,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913418073] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:34,725 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:34,726 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 23:15:34,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732741076] [2023-11-24 23:15:34,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:34,733 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:15:34,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:34,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:15:34,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:34,795 INFO L87 Difference]: Start difference. First operand has 293 states, 130 states have (on average 2.353846153846154) internal successors, (306), 279 states have internal predecessors, (306), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:35,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:35,503 INFO L93 Difference]: Finished difference Result 499 states and 552 transitions. [2023-11-24 23:15:35,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:15:35,506 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-24 23:15:35,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:35,522 INFO L225 Difference]: With dead ends: 499 [2023-11-24 23:15:35,522 INFO L226 Difference]: Without dead ends: 498 [2023-11-24 23:15:35,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:35,528 INFO L413 NwaCegarLoop]: 196 mSDtfsCounter, 224 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:35,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 362 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:15:35,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2023-11-24 23:15:35,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 364. [2023-11-24 23:15:35,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 204 states have (on average 2.3186274509803924) internal successors, (473), 350 states have internal predecessors, (473), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:35,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 501 transitions. [2023-11-24 23:15:35,620 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 501 transitions. Word has length 2 [2023-11-24 23:15:35,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:35,621 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 501 transitions. [2023-11-24 23:15:35,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:35,621 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 501 transitions. [2023-11-24 23:15:35,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-24 23:15:35,622 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:35,622 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-24 23:15:35,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:15:35,623 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:35,623 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:35,623 INFO L85 PathProgramCache]: Analyzing trace with hash 18450, now seen corresponding path program 1 times [2023-11-24 23:15:35,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:35,624 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541528613] [2023-11-24 23:15:35,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:35,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:35,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:35,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:35,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:35,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541528613] [2023-11-24 23:15:35,718 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541528613] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:35,718 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:35,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 23:15:35,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380518696] [2023-11-24 23:15:35,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:35,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:15:35,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:35,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:15:35,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:35,721 INFO L87 Difference]: Start difference. First operand 364 states and 501 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:36,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:36,056 INFO L93 Difference]: Finished difference Result 365 states and 504 transitions. [2023-11-24 23:15:36,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:15:36,057 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-24 23:15:36,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:36,060 INFO L225 Difference]: With dead ends: 365 [2023-11-24 23:15:36,060 INFO L226 Difference]: Without dead ends: 365 [2023-11-24 23:15:36,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:36,063 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 5 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:36,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 459 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:15:36,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2023-11-24 23:15:36,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 362. [2023-11-24 23:15:36,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 204 states have (on average 2.3088235294117645) internal successors, (471), 348 states have internal predecessors, (471), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:36,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 499 transitions. [2023-11-24 23:15:36,095 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 499 transitions. Word has length 2 [2023-11-24 23:15:36,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:36,096 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 499 transitions. [2023-11-24 23:15:36,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:36,096 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 499 transitions. [2023-11-24 23:15:36,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:15:36,097 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:36,097 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:36,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:15:36,097 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:36,098 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:36,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1409403644, now seen corresponding path program 1 times [2023-11-24 23:15:36,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:36,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866554767] [2023-11-24 23:15:36,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:36,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:36,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:36,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:36,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:36,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866554767] [2023-11-24 23:15:36,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866554767] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:36,224 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:36,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:15:36,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982654718] [2023-11-24 23:15:36,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:36,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:15:36,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:36,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:15:36,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:36,226 INFO L87 Difference]: Start difference. First operand 362 states and 499 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:36,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:36,562 INFO L93 Difference]: Finished difference Result 357 states and 494 transitions. [2023-11-24 23:15:36,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:15:36,563 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:15:36,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:36,567 INFO L225 Difference]: With dead ends: 357 [2023-11-24 23:15:36,568 INFO L226 Difference]: Without dead ends: 357 [2023-11-24 23:15:36,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:36,577 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 39 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:36,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 399 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:15:36,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2023-11-24 23:15:36,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2023-11-24 23:15:36,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 204 states have (on average 2.284313725490196) internal successors, (466), 343 states have internal predecessors, (466), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:36,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 494 transitions. [2023-11-24 23:15:36,610 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 494 transitions. Word has length 8 [2023-11-24 23:15:36,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:36,610 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 494 transitions. [2023-11-24 23:15:36,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:36,611 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 494 transitions. [2023-11-24 23:15:36,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:15:36,612 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:36,612 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:36,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:15:36,612 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:36,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:36,613 INFO L85 PathProgramCache]: Analyzing trace with hash -1409403643, now seen corresponding path program 1 times [2023-11-24 23:15:36,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:36,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265749375] [2023-11-24 23:15:36,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:36,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:36,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:36,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:36,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265749375] [2023-11-24 23:15:36,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265749375] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:36,778 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:36,778 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:15:36,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364710582] [2023-11-24 23:15:36,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:36,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:15:36,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:36,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:15:36,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:36,780 INFO L87 Difference]: Start difference. First operand 357 states and 494 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:37,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:37,115 INFO L93 Difference]: Finished difference Result 352 states and 489 transitions. [2023-11-24 23:15:37,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:15:37,116 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:15:37,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:37,119 INFO L225 Difference]: With dead ends: 352 [2023-11-24 23:15:37,119 INFO L226 Difference]: Without dead ends: 352 [2023-11-24 23:15:37,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:15:37,121 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 34 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:37,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 410 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:15:37,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2023-11-24 23:15:37,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2023-11-24 23:15:37,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 204 states have (on average 2.2598039215686274) internal successors, (461), 338 states have internal predecessors, (461), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:37,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 489 transitions. [2023-11-24 23:15:37,151 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 489 transitions. Word has length 8 [2023-11-24 23:15:37,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:37,152 INFO L495 AbstractCegarLoop]: Abstraction has 352 states and 489 transitions. [2023-11-24 23:15:37,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:37,152 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 489 transitions. [2023-11-24 23:15:37,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 23:15:37,153 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:37,153 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:37,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:15:37,155 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:37,156 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:37,156 INFO L85 PathProgramCache]: Analyzing trace with hash -741839576, now seen corresponding path program 1 times [2023-11-24 23:15:37,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:37,156 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896242113] [2023-11-24 23:15:37,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:37,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:37,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:37,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:37,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:37,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896242113] [2023-11-24 23:15:37,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896242113] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:37,421 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:37,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:15:37,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923255942] [2023-11-24 23:15:37,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:37,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:15:37,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:37,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:15:37,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:15:37,425 INFO L87 Difference]: Start difference. First operand 352 states and 489 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:38,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:38,186 INFO L93 Difference]: Finished difference Result 475 states and 526 transitions. [2023-11-24 23:15:38,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:15:38,187 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 23:15:38,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:38,190 INFO L225 Difference]: With dead ends: 475 [2023-11-24 23:15:38,191 INFO L226 Difference]: Without dead ends: 475 [2023-11-24 23:15:38,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:15:38,192 INFO L413 NwaCegarLoop]: 145 mSDtfsCounter, 288 mSDsluCounter, 485 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:38,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 630 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:15:38,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2023-11-24 23:15:38,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 344. [2023-11-24 23:15:38,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 204 states have (on average 2.2205882352941178) internal successors, (453), 330 states have internal predecessors, (453), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:38,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 481 transitions. [2023-11-24 23:15:38,208 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 481 transitions. Word has length 9 [2023-11-24 23:15:38,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:38,209 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 481 transitions. [2023-11-24 23:15:38,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:38,209 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 481 transitions. [2023-11-24 23:15:38,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 23:15:38,210 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:38,210 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:38,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:15:38,210 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:38,211 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:38,211 INFO L85 PathProgramCache]: Analyzing trace with hash -741839575, now seen corresponding path program 1 times [2023-11-24 23:15:38,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:38,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510128299] [2023-11-24 23:15:38,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:38,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:38,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:38,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:38,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510128299] [2023-11-24 23:15:38,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510128299] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:38,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:38,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:15:38,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637197998] [2023-11-24 23:15:38,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:38,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:15:38,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:38,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:15:38,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:15:38,468 INFO L87 Difference]: Start difference. First operand 344 states and 481 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:39,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:39,385 INFO L93 Difference]: Finished difference Result 465 states and 516 transitions. [2023-11-24 23:15:39,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:15:39,386 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 23:15:39,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:39,389 INFO L225 Difference]: With dead ends: 465 [2023-11-24 23:15:39,389 INFO L226 Difference]: Without dead ends: 465 [2023-11-24 23:15:39,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:15:39,391 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 734 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 734 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:39,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [734 Valid, 306 Invalid, 839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-24 23:15:39,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-11-24 23:15:39,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 335. [2023-11-24 23:15:39,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 204 states have (on average 2.1715686274509802) internal successors, (443), 321 states have internal predecessors, (443), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:15:39,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 471 transitions. [2023-11-24 23:15:39,405 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 471 transitions. Word has length 9 [2023-11-24 23:15:39,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:39,405 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 471 transitions. [2023-11-24 23:15:39,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:39,405 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 471 transitions. [2023-11-24 23:15:39,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-24 23:15:39,406 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:39,406 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:39,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 23:15:39,407 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:39,407 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:39,407 INFO L85 PathProgramCache]: Analyzing trace with hash 1126128672, now seen corresponding path program 1 times [2023-11-24 23:15:39,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:39,408 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001142290] [2023-11-24 23:15:39,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:39,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:39,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:39,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:39,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:39,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001142290] [2023-11-24 23:15:39,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001142290] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:39,935 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:39,936 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-24 23:15:39,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908481276] [2023-11-24 23:15:39,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:39,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:15:39,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:39,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:15:39,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:15:39,938 INFO L87 Difference]: Start difference. First operand 335 states and 471 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:40,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:40,450 INFO L93 Difference]: Finished difference Result 352 states and 491 transitions. [2023-11-24 23:15:40,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:15:40,451 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-24 23:15:40,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:40,454 INFO L225 Difference]: With dead ends: 352 [2023-11-24 23:15:40,454 INFO L226 Difference]: Without dead ends: 352 [2023-11-24 23:15:40,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:15:40,455 INFO L413 NwaCegarLoop]: 252 mSDtfsCounter, 20 mSDsluCounter, 761 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 1013 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:40,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 1013 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:15:40,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2023-11-24 23:15:40,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 342. [2023-11-24 23:15:40,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 210 states have (on average 2.142857142857143) internal successors, (450), 327 states have internal predecessors, (450), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-24 23:15:40,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 480 transitions. [2023-11-24 23:15:40,475 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 480 transitions. Word has length 16 [2023-11-24 23:15:40,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:40,475 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 480 transitions. [2023-11-24 23:15:40,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:40,476 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 480 transitions. [2023-11-24 23:15:40,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-24 23:15:40,477 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:40,477 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:40,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-24 23:15:40,478 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:40,478 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:40,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1753093338, now seen corresponding path program 1 times [2023-11-24 23:15:40,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:40,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330619350] [2023-11-24 23:15:40,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:40,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:40,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:40,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:40,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:40,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330619350] [2023-11-24 23:15:40,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330619350] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:15:40,927 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:15:40,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-24 23:15:40,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188556982] [2023-11-24 23:15:40,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:15:40,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:15:40,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:15:40,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:15:40,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-24 23:15:40,929 INFO L87 Difference]: Start difference. First operand 342 states and 480 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:41,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:15:41,751 INFO L93 Difference]: Finished difference Result 476 states and 529 transitions. [2023-11-24 23:15:41,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 23:15:41,752 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-24 23:15:41,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:15:41,756 INFO L225 Difference]: With dead ends: 476 [2023-11-24 23:15:41,756 INFO L226 Difference]: Without dead ends: 476 [2023-11-24 23:15:41,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:15:41,757 INFO L413 NwaCegarLoop]: 164 mSDtfsCounter, 224 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 883 SdHoareTripleChecker+Invalid, 821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:15:41,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 883 Invalid, 821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 813 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:15:41,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2023-11-24 23:15:41,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 344. [2023-11-24 23:15:41,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 212 states have (on average 2.1320754716981134) internal successors, (452), 329 states have internal predecessors, (452), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-24 23:15:41,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 482 transitions. [2023-11-24 23:15:41,776 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 482 transitions. Word has length 17 [2023-11-24 23:15:41,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:15:41,776 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 482 transitions. [2023-11-24 23:15:41,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:15:41,777 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 482 transitions. [2023-11-24 23:15:41,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-24 23:15:41,779 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:15:41,779 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:15:41,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-24 23:15:41,780 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-24 23:15:41,784 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:15:41,784 INFO L85 PathProgramCache]: Analyzing trace with hash 942861367, now seen corresponding path program 1 times [2023-11-24 23:15:41,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:15:41,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183801127] [2023-11-24 23:15:41,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:41,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:15:41,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:43,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:43,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:15:43,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183801127] [2023-11-24 23:15:43,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183801127] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:15:43,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319010706] [2023-11-24 23:15:43,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:15:43,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:15:43,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:15:43,052 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:15:43,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe95a7b1-cd2f-4dc9-a6f9-01679a63f439/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:15:43,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:15:43,231 INFO L262 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-24 23:15:43,240 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:15:43,299 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-24 23:15:43,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-24 23:15:43,724 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-24 23:15:43,724 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-11-24 23:15:43,739 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-24 23:15:43,887 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-24 23:15:43,888 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2023-11-24 23:15:43,923 WARN L214 Elim1Store]: Array PQE input equivalent to false [2023-11-24 23:15:44,107 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-24 23:15:44,117 INFO L349 Elim1Store]: treesize reduction 18, result has 30.8 percent of original size [2023-11-24 23:15:44,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 24 [2023-11-24 23:15:44,313 INFO L349 Elim1Store]: treesize reduction 48, result has 36.0 percent of original size [2023-11-24 23:15:44,314 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 41 [2023-11-24 23:15:44,408 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 25 [2023-11-24 23:15:44,528 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 25 [2023-11-24 23:15:44,563 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 25 [2023-11-24 23:15:44,658 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 17 [2023-11-24 23:15:44,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:15:44,732 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:15:49,190 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:15:49,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2023-11-24 23:15:49,210 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:15:49,211 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 118 [2023-11-24 23:15:49,220 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 78 [2023-11-24 23:15:49,231 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2023-11-24 23:15:49,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319010706] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:15:49,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [207801688] [2023-11-24 23:15:49,676 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-11-24 23:15:49,677 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:15:49,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:15:49,687 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:15:49,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:15:50,866 INFO L197 IcfgInterpreter]: Interpreting procedure append with input of size 266 for LOIs [2023-11-24 23:15:55,292 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:20,732 WARN L293 SmtUtils]: Spent 14.31s on a formula simplification. DAG size of input: 266 DAG size of output: 263 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)